Invoice must be correctly grouped.

(it is nto correctly working)

This reverts commit 4795c8db.

This reverts commit c22e0d0c.

* always create open order before trying to allocate
* Add a step to trigger all alarms
* do not force open order creation before allocation
* do not install slapos_subscription_request
  Everything should work without it.
  It will be rework later.
* LESS TESTS